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Income Taxes - Summary of Tax Losses Carryforwards and their Years of Expiration (Detail)
$ in Millions
Dec. 31, 2017
MXN ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [abstract]  
2021 $ 15
2022 0
2023 0
2024 2
2025 4
2026 and thereafter 8,732
No expiration (Brazil and Colombia (until 2016)) 16,064
Tax Loss Carryforwards $ 24,817